Tape recorder

ABSTRACT

The present invention relates to a tape recorder and, more particularly, to a tape recorder having an automatic reverse function. The tape recorder has selecting means, a head and a head rotating mechanism. When control buttons are operated by a user, the selecting means can select one of the forward and reverse tape transport directions, and the head rotating mechanism can rotate the head to one of the two positions corresponding to the forward and reverse tape transport directions in accordance with a selection by said selecting means, tape contact surface facing the tape.

BACKGROUND OF THE INVENTION

The present invention relates to a tape recorder and, more particularly,to a tape recorder having an automatic reverse function.

A known mechanism for recording and playing back signals on and from amagnetic tape in the forward and reverse directions is called anautomatic reverse mechanism. The user need not change the side of thetape and the current operation mode when the tape reaches its terminalend in the forward record or play mode. Recording or playback isautomatically performed also in the reverse direction. Therefore, if theuser wishes to record or play back the tape over a long period of time,he can conveniently use the automatic reverse mechanism.

In the automatic reverse mechanism of this type, a record/play head mustcome in contact with a corresponding track of the tape at apredetermined azimuth in the forward or reverse tape transport directionto obtain optimal results. For this purpose, the record/play head mustbe rotated properly in accordance with the forward and reverse operationmodes. In general, the head is rotated substantially perpendicularly tothe longitudinal direction of the tape by a switching means for a head.Therefore, a sufficiently large space must be provided to allow rotationof the head in the tape recorder mechanisms and the tape recorderbecomes large in size.

In order to solve the above problem, conventionally, the head isrotated, while its surface in contact with the tape (to be referred toas a tape contact surface hereinafter) faces the tape. Thus, anexcessive space is eliminated. However, the head rotating means of thistype must be further improved. It is strongly desired that variousimprovements in structure, assembly, and loss characteristic inrecording and playback signals of the tape be made in accordance withuser's needs.

SUMMARY OF THE INVENTION

The present invention has been made in consideration of this and has forits object to provide a compact tape recorder of simple construction foreasy assembly wherein a head is systematically and effectively moved toa position corresponding to a tape transport direction when forward andreverse operation modes are switched.

According to one aspect of the present invention, there is provided atape recorder comprising: selecting means for selecting one of theforward and reverse tape transport directions; a head having a tapecontact surface; and a head rotating mechanism for rotating said head toone of the two positions corresponding to the forward and reverse tapetransport directions in accordance with a selection by said selectingmeans, said tape contact surface facing the tape.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 and 2 are schematic perspective views of a tape recorderaccording to one embodiment of the present invention, respectively;

FIG. 3 is a plan view of a forward/reverse switching mechanism for atape in the tape recorder shown in FIGS. 1 and 2;

FIGS. 4 and 5 are plan views for explaining the mode of operation of theforward/reverse switching mechanism, respectively;

FIGS. 6A to 6C are respectively a schematic perspective view of a headrotating mechanism, a perspective view for explaining the mode ofoperation thereof, and a perspective view thereof when a record head isseparated from a play head;

FIGS. 7 and 8 are detailed, exploded, perspective views of the headrotating mechanism, respectively;

FIGS. 9A to 9C are views for explaining the arrangement and the mode ofoperation of a torsion spring used in the head rotating mechanism;

FIGS. 10A and 10B and FIGS. 11A and 11B are views of the head rotatingmechanism when viewed at various angles, respectively;

FIGS. 12A to FIG. 12F are partial views of a tape transport directionindicator disposed in the head rotating mechanism;

FIG. 13 is a view illustrating the mounting condition of the headrelative to a cassette half;

FIGS. 14A to 14C are views for explaining the relation between thelevels of the record/play head and the erase head and its effects; and

FIGS. 15 to 17 are views illustrating the mounting conditions of therecord/play head and the erase head.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A tape recorder according to one embodiment of the present inventionwill be described hereinafter with reference to the accompanyingdrawings.

Referring to FIGS. 1 and 2, reference numeral 11 denotes a substantiallybox-shaped main chassis of a compact cassette tape recorder. Variousmechanisms are mounted on front and back portions, upper and lowerportions and right and left portions of the main chassis 11. A controlsection 12 extends toward the front from the lower end of the mainchassis 11, as shown in FIG. 1. The control section 12 has a STOP button121 which also functions as an EJECT button, a REW button 122 forrewinding the tape, a PLAY (R) button 123 for playing back the tape inthe reverse direction, a REC button 124 for recording signals on thetape, a PLAY (F) button 125 for playing back the tape in the forwarddirection, an FF button 126 for fast forwarding the tape, a PAUSE button127 for temporarily stopping the tape in the order named when viewedfrom the left in FIG. 1. The user can press these buttons 121 to 127with piano touch in the direction indicated by arrow A to drive drivemechanisms through control levers (not shown), respectively. Thesebuttons 121 to 127 can be returned to the original positions asindicated by arrow B. When the user presses one of the buttons 121 to127, the control lever which is vertically reciprocally slidable on therear side of a flat surface 111 of the main chassis 11 in FIG. 1 isengaged with a known locking mechanism (not shown) and is lockedthereby. However, the control lever of the STOP button 121 cannot belocked by the locking mechanism. This lever is engaged with the lockingmechanism to release the locking condition of other control levers ofother buttons 122 to 127. The control lever of the PAUSE button 127operates independently of the locking mechanism. This control lever isengaged with a known push-push mechanism (not shown) disposed at therear side of the flat surface 111 of the main chassis 11. When the userfirst presses the PAUSE button 127, it is locked to temporarily stop theplayback mode or the like. When he presses it again, the lockingcondition of the PAUSE button 127 is released to initiate the playbackmode or the like.

The control lever of the REW or FF button 122 or 126 selectively drivesa forward/reverse switching mechanism (not shown) for the high speeddrive system. Therefore, the tape is driven at a high speed in theforward or reverse direction. The control lever of the PLAY (R) or PLAY(F) button 123 or 124 selectively drives a forward/reverse switchingmechanism 100 for the normal speed drive system. Therefore, the tape isdriven at the normal speed in the forward or reverse direction. Thelevers of the PLAY (R) and PLAY (F) buttons 123 and 124 drive a headslider 13 which is reciprocally slidable in the direction indicated byarrows C and D in FIG. 1. A record/play head 14 mounted on the headslider 13 then comes into contact with a predetermined surface of thetape. Simultaneously, a pinch roller 15 or 16 comes in contact with acapstan 17 or 18. Playback is then performed in the forward or reversedirection. The record/play head 14 is moved to have a proper azimuth inthe forward or reverse tape transport direction by a head movingmechanism 101 and comes in contact with a corresponding track of thetape properly. The arrangement and the mode of operation of the headmoving mechanism 101 will be described in detail later.

In a normal tape recorder, only a single PLAY button is used toreproduce the signals from the tape in the forward direction. However,in a tape recorder having an automatic reverse function under discussionrecording and playback must be performed in both of forward and reversedirections. Therefore, two independent PLAY buttons are required for theforward and reverse modes, respectively. When the user presses one ofthe PLAY buttons, the tape is driven in the specified direction. When hepresses two PLAY buttons simultaneously, the automatic reverse functionis initiated. If he wishes to play back the tape in the forwarddirection, he only presses the PLAY (F) button.

When the user wishes to drive the tape in one tape transport directionand record it, he must press the REC button 124 and the PLAY (R) or PLAY(F) button 123 or 125 simultaneously to drive the tape in a desireddirection for recording. Further, when the user wishes to record thetape in the automatic reverse mode, he presses the REC button 124 andthe PLAY (R) and PLAY (F) buttons 123 and 125 simultaneously. Thus, therecording system is operated.

Referring to FIG. 1, right and left reel tables 20 and 19 extend at thecenter of the main chassis 11. These tables are connected to anautomatic stop mechanism for automatically stopping the tape when thetape reaches its initial or terminal end and to the forward/reverseswitching mechanisms. In the upper portion of the main chassis 11 inFIG. 1 are arranged a tape counter 21 connected to the right reel table20, a motor 22 for driving drive mechanisms, a mechanism for determiningthe number of times of reciprocal movements, and control levers 23 and24 of a manual reverse mechanism used for reversing the tape transportdirection at an arbitrary position determined by the user.

FIG. 3 shows the forward/reverse switching mechanism 100 of the normalspeed drive system shown in FIGS. 1 and 2. The head slider 13 shown inFIG. 1 is illustrated in a simplified manner for illustrativeconvenience, as indicated by the broken line. A pair of projections 131and 132 are formed at predetermined positions of both sides of the headslider 13. The projections 131 and 132 of the head slider 13 are engagedwith engaging portions 252 and 262 formed at the lower portions (viewedin the figure) of through holes 251 and 261, respectively. The throughholes 251 and 261 are formed substantially at the centers of left andright playback sliders 25 and 26, respectively shown by the alternatelong and two short dashed line in the FIG. 3 aligned on the rear surfaceof the head slider 13. The right and left playback sliders 26 and 25have elongate holes 263 and 264 and elongate holes 253 and 254,respectively. These elongate holes 253 and 254 are engaged with guidepins 255 and 256 formed on the main chassis 11, while the elongate holes263 and 264 are engaged with guide pins 265 and 266 formed thereon. Theright and left playback sliders 26 and 25 are supported in the samemanner as the head slider 13 to be reciprocally slidable in thedirection indicated by arrows C and D.

The right and left playback sliders 26 and 25 operate in cooperationwith the control levers of the PLAY (F) and PLAY (R) buttons 125 and 123through springs (not shown), respectively. When the user presses thePLAY (F) and PLAY (R) buttons 125 and 123, the right and left playbacksliders 26 and 25 are biased in the direction indicated by arrow C,respectively. The right playback slider 26 and the left playback slider25 control the pinch rollers 16 and 15, respectively. Simultaneously,the playback sliders 26 and 25 control idlers (not shown), gears (notshown) and the like which transmit the rotational force of the motor 22to the right and left reel tables 20 and 19, respectively. When the leftplayback slider 25 is slid in the direction indicated by arrow C, thepinch roller 15 comes in tight contact with the capstan 17 (FIG. 1) andthe left reel table 19 is driven to take up the tape. Thus, the tape isplayed back in the reverse direction. Similarly, when the right playbackslider 26 is slid in the direction indicated by arrow C, the pinchroller 16 comes in tight contact with the capstan 18 (FIG. 1) and theright reel table 20 is driven to take up the tape. Thus, the tape isplayed back in the forward direction. The forward or reverse tapetransport direction is determined by movement of the right or leftplayback slider 26 or 25 in the direction indicated by arrow C in FIG.3.

A tapered stopper 257 is formed at the upper right side of the leftplayback slider 25. A stopper 267 having a substantially concave-shapednotch is formed substantially at the upper center of the right playbackslider 26. Under the right and left playback sliders 26 and 25, asubstantially T-shaped reverse drive lever 27 is rotatably supported ona shaft 112 projecting from the main chassis 11. A bending portion 272which engages with the stopper 257 of the left playback slider 25 isformed to the left of a proximal portion 271 of the reverse drive lever27. A bending portion 273 which engages with the stopper 267 is formedto the right of the proximal portion 271 of the reverse drive lever 27.Further, a substantially crank-shaped elongate hole 274 is formed to theleft of the proximal portion 271 of the reverse drive lever 27.

A projection 281 extending from one side surface of a gear 28 rotatablysupported by a shaft 113 projecting from the main chassis 11 is fittedin the elongate hole 274 of the reverse drive lever 27. Therefore, whenthe gear 28 is rotated, the reverse drive lever 27 pivots about theshaft 112. A pair of stoppers 282 and 283 which can be engaged with alocking lever 29 to be described later are formed on a side of the gear28 opposite to the side thereof from which the projection 281 extends.The stoppers 282 and 283 oppose each other about the center of the shaft113. The locking lever 29 is rotatably supported on a shaft 114 disposedon the main chassis 11. The locking lever 29 has an engaging portion 291which is selectively engageable with the stoppers 282 and 283 of thegear 28. The locking lever 29 is biased in a direction in which theengaging portion 291 is normally engaged with the stoppers 282 and 283of the gear 28, that is, in the counterclockwise direction in FIG. 3 bythe biasing force of a spring (not shown). However, the locking lever 29is pivoted against the biasing force of the spring in the clockwisedirection in FIG. 3 when the tape terminal end is detected in theforward/reverse switching mode and when the user operates the controllever 24 (FIG. 1) of the manual reverse mechanism. Therefore, thelocking lever 29 causes the engaging portion 291 to be released from thestoppers 282 and 283 of the gear 28.

A first gear (not shown) always meshes with the gear 28. The gear ratioof the first gear to the gear 28 is 1:2. When the first gear is revolvedonce, the gear 28 is rotated half the revolution. A notched portion isformed at a predetermined portion of the first gear. Independently ofthe tape travel, a second gear which is rotated in one direction by therotational force of the motor 22 is disposed at a position to oppose thenotched portion. The second gear meshes with the first gear and isdriven to rotate the gear 28 in the clockwise direction.

With the forward/reverse mechanism 100 of the above arrangement, assumethat the user presses the PLAY (F) and PLAY (R) buttons 125 and 123simultaneously to initiate the automatic reverse mode. The right andleft playback sliders 26 and 25 are slid in the direction indicated byarrow C in FIG. 3 altogether through the control levers and springswhich operate incorporation with the buttons 125 and 123. If theengaging portion 291 of the locking lever 29 is engaged with the stopper283 of the gear 28 as shown in FIG. 3, the position of the reverse drivelever 27 is regulated by the projection 281. Therefore, the rightplayback slider 26 is sufficiently moved to the direction indicated byarrow C. However, the stopper 257 of the left playback slider 25 abutsagainst the bending portion 272 of the reverse drive lever 27. The leftplayback slider 25 is not moved sufficiently to the direction indicatedby arrow C. Therefore, the pinch roller 16 and the idler controlled bythe right playback slider 26 come in tight contact with the capstan 18and are moved to a predetermined position to rotate the right reel table20. Thus, the tape is played back in the forward direction. Along withthe movement of the right playback slider 26 in the direction indicatedby arrow C, the engaging portion 262 comes in contact with theprojection 132 of the head slider 13. The head slider 13 is then movedin the direction indicated by arrow C. The record/play head 14 (FIG. 1)to be described in detail later and disposed on the head slider 13 comesin contact with the tape. Simultaneously, since the reverse drive lever27 stops the left playback slider 25 which is biased in the directionindicated by arrow C, the force is applied to the reverse drive lever 27in the clockwise direction. The gear 28 which has the projection 281fitted in the elongate hole 274 of the reverse drive lever 27 isrotatably biased in the clockwise direction. However, since the stopper283 of the gear 28 is engaged with the engaging portion 291 of thelocking lever 29, the gear 28 is not rotated and the reverse drive lever27 is kept in a position shown in FIG. 3.

Assume that the tape reaches its terminal end in the forward playbackmode described above. The locking lever 29 is pivoted in the clockwisedirection by the tape end detecting mechanism, as shown in FIG. 4. Theengaging portion 291 of the locking lever 29 is released from thestopper 283 of the gear 28. As described above, since the biasing forceis applied to the gear 28 in the clockwise direction as shown in FIG. 3,the gear 28 is slightly rotated in the clockwise direction, as shown inFIG. 4. The first gear meshed with the gear 28 is slightly rotated inthe counterclockwise direction. The first gear then meshes with thesecond gear, so that the gear 28 is rotated in the clockwise directionby the rotating force of the second gear.

When the first gear is revolved once and its notched portion opposes thesecond gear, the gear 28 is pivoted half the revoltion as shown in FIG.5. The stopper 282 of the gear 28 abuts against the engaging portion 291of the locking lever 29. When the gear 28 is pivoted by half therevolution, the reverse drive lever 27 is pivoted in the clockwisedirection as shown in FIG. 5, following the movement of the projection281. The bending portion 273 of the reverse drive lever 27 comes incontact with the stopper 267 of the right playback slider 26, so thatthe right playback slider 26 is moved backward in the directionindicated by arrow D. However, the stopper 257 of the left playbackslider 25 is disengaged from the bending portion 272 of the reversedrive lever 27, so that the left playback slider 25 is sufficientlymoved in the direction indicated by arrow C. The pinch roller 15 and theidler controlled by the left playback slider 25 come in tight contactwith the capstan 17 and are moved to a predetermined position to rotatethe left reel table 19. Thus, the tape is played back in the reverse .direction. Along with the movement of the left playback slider 25 in thedirection indicated by arrow C, the engaging portion 252 of the leftplayback slider 25 abuts against the projection 131 of the head slider13 to move the head slider 13 in the direction indicated by arrow C. Therecord/play head 14 disposed on the head slider 13 then comes in contactwith the tape.

The head slider 13 is moved backward in the direction indicated by arrowD when the tape transport direction is changed from the forwarddirection to the reverse direction or from the reverse direction to theforward direction by a mechanism to be described later. Thereafter,along with the movement of the right or left playback slider 26 or 25 inthe direction indicated by arrow C, the head slider 13 is moved in theforward or backward direction.

Referring to FIG. 5, since the right playback slider 26 biased in thedirection indicated by arrow C is stopped by the reverse drive lever 27,the force acts on the reverse drive lever 27 in the counterclockwisedirection. The force thus acts on the gear 28 in the clockwisedirection. However, since the stopper 282 of the gear 28 is engaged withthe engaging portion 291 of the locking lever 29, the gear 28 is notrotated and the reverse drive lever 27 is kept at a position indicatedin FIG. 5.

When the tape reaches its initial end in the reverse playback modedescribed above, the locking lever 29 is pivoted in the clockwisedirection by the tape end detecting mechanism. The gear 28 is pivoted byhalf the revolution in the clockwise direction. The tape is played backin the forward direction as shown in FIG. 3. As is apparent from theabove description, the forward/reverse switching mechanism for the tapeis not only driven at the terminal end of the tape but also driven whenthe control lever 24 of the manual reverse mechanism is operated. Thetape transport direction can be arbitrarily changed at desired time.

The forward/reverse switching mechanism 100 for the tape transportdirection has been described above. The head moving mechanism 101(FIG. 1) will be described below. A bending portion 276 is formed at thetop of a stem 275 of a substantially T-shaped reverse drive lever 27.The guide pins 256 and 266 are fitted in the elongate holes 254 and 264of the left and right playback sliders 25 and 26, respectively. Theguide pins 256 and 266 are further fitted in elongate holes 301 and 302and elongate holes 311 and 312 which are respectively formed at bothends of a control slider 30 and a drive slider 31 between the mainchassis 11 and the left and right sliders 25 and 26. These sliders 30and 31 overlap with each other and are supported to be reciprocallyslidable in a direction perpendicular to a sliding direction of theright and left playback sliders 26 and 25, that is, in the directionindicated by arrows E and F.

A through hole 303 is formed substantially at the center of the controlslider 30. A fitting portion 304 of a substantially concave-shapedrecess is formed at the lower portion of the through hole 303. A drivenportion of a sector-shaped gear disposed in the head rotating mechanismto be described later is fitted in the fitting portion 304. A pair ofstoppers 305 and 306 are spaced apart at equal intervals along thelongitudinal direction of the control slider 30 and are formed to theright of the fitting portion 304 of the through hole 303.

A through hole 313 is formed substantially at the center of the driveslider 31. A tapered projection 314 of a substantially conical shape isformed at the upper portion of the through hole 313. A pin 133 disposedat the lower portion of the head slider 13 can be engaged with theprojection 314. A pair of stoppers 315 and 316 which are spaced apart atequal intervals along the longitudinal direction of the drive slider 31are formed to the right of the projection 314 extending in the throughhole 313. The bending portion 276 is formed at a stem 275 of the reversedrive lever 27.

A bending portion 317 is formed between the stoppers 305 and 306 of thecontrol slider 30 and at the lower portion of the through hole 313.

Assume that the tape is played back in the forward direction. Thereverse drive lever 27 is located at the position in FIG. 3. The bendingportion 276 of the reverse drive lever 27 abuts against the stopper 316of the drive slider 31. The drive slider 31 is moved in the directionindicated by arrow F. The bending portion 317 of the drive slider 31abuts against the stopper 306 of the control slider 30. The controlslider 30 is also moved in the direction indicated by arrow F.

When the forward tape transport direction is changed to the reverse tapetransport direction in the forward playback mode, the reverse drivelever 27 is pivoted in the clockwise direction as shown in FIG. 4. Thebending portion 276 of the reverse drive lever 27 abuts against thestopper 315 of the drive slider 31. The drive slider 31 is then moved inthe direction indicated by arrow E. The bending portion 317 of the driveslider 31 is moved between the stoppers 305 and 306 of the controlslider 30 and the control slider 30 is not moved. Along with movement ofthe drive slider 31 in the direction indicated by arrow E, the pin 133of the head slider 13 is moved downward along the tapered projection314. The head slider 13 is thus moved backward in the directionindicated by arrow D when the forward tape transport direction ischanged to the reverse tape transport direction.

When the reverse playback mode is initiated, the drive slider 31 issufficiently moved in the direction indicated by arrow E in FIG. 5. Thepin 133 of the head slider 13 is moved over the vertex of the projection314 of the drive slider 31 to a position opposite to the position shownin FIG. 3. Simultaneously, the left playback slider 25 is sufficientlymoved to the direction indicated by arrow C, the head slider 13 havingthe projection 131 engaged with the engaging portion 252 is also movedin the same direction. The pin 133 of the head slider 13 urges theprojection 314 of the drive slider 31 in the opposite direction. Thestopper 315 of the drive slider 31 is further moved in the directionindicated by arrow E against the urging force of the bending portion 276of the reverse drive lever 27. The control slider 30 is also movedsufficiently in the direction indicated by arrow E upon movement of thedrive slider 31.

If the user wishes to change the reverse playback mode to the forwardplayback mode, the reverse drive lever 27 is pivoted in thecounterclockwise direction in FIG. 5. The bending portion 276 of thereverse drive lever 27 urges the stopper 316 of the drive slider 31. Thedrive slider 31 and the control slider 30 are moved in the directionindicated by arrow F. Thus, the state shown in FIG. 3 is restored.During this switching operation, the head slider 13 is temporarily movedbackward in the direction indicated by arrow D and then advancesforward.

In the switching operation from the reverse playback mode to the forwardplayback mode or from the forward playback mode to the reverse playbackmode, the drive slider 31 and the control slider 30 are moved in thedirections indicated by arrows E and F, respectively, in order to drivea head rotating mechanism 102. The head rotating mechanism 102 will bedescribed below. FIG. 6A shows the outer appearance of the schematicarrangement of the head rotating mechanism 102. The record/play head 14for a microcassette tape recorder has a tape contact surface 142. Thetape contact surface 142 has a head portion 141 for recording andreproducing the signals at one side. The record/play head 14 aredisposed parallel to an erase head 32 used for a microcassette taperecorder. These heads are fitted in a substantially cylindrical headsupport 33.

A head mount assembly 34 coaxially integrally supports a head base plate35 and a gear 36, as shown in FIG. 6A. A substantially sector-shapedgear 37 meshes with the gear 36. The central portion of the gear 37 isrotatably mounted on the head mount assembly 34. The head support 33 ismounted on the head base plate 35.

A mount portion 341 of the head mount assembly 34 is in contact with thehead slider 13 and mounted thereon by screws or the like (not shown).The head mount assembly 34 is mounted on the head slider 13 and the tapecontact surface 142 of the record/play head 14 faces upward in FIG. 3. Adriven portion 371 extends from the central portion of the gear 37 andthe head mount assembly 34 is mounted on the head slider 13.Simultaneously, the driven portion 371 is fitted in the fitting portion304 of the control slider 30. Even if the head slider 13 is moved in thedirection indicated by arrows C and D in FIG. 3, the driven portion 371is not disengaged from the fitting portion 304 and is always fittedtherein. When the forward playback mode is changed to the reverseplayback mode or when the reverse playback mode is changed to theforward playback mode, the gear 37 pivots about the central portion uponmovement of the control slider 30 in the direction indicated by arrows Eand F.

Now assume that the gear 37 is pivoted in the direction indicated byarrow G in FIG. 6A. The gear 36 meshed with the gear 37 is rotated inthe direction indicated by arrow H and the head base plate 35 and thehead support 33 are also rotated in the same direction. The record/playhead 14 and the erase head 32 are rotated through 180° as shown in FIG.6B. The head portion 141 faces the lower track of the tape 38 indicatedby the alternate long and two short dashed line in FIG. 6A, while thehead portion 141 faces the upper track of the tape 38 as shown in FIG.6B. The head portion is moved to face a corresponding track of the tape38 in the forward/reverse switching operation. Further, when the gear 37is rotated in the direction indicated by arrow I in FIG. 6B, the gear36, the head base plate 35 and the head support 33 are rotated in thedirection indicated by arrow J and the record/play head 14 and the erasehead 32 return to the original positions.

The record/play head 14 and the erase head 32 are inserted through headinsertion holes formed in the cassette half and come in contact with thetape.

A pair of stoppers 351 and 352 extend from the parts of the head baseplate 35. A pair of screws 342 and 343 are screwed at one side of thehead mount assembly 34. The head base plate 35 is rotated until thestoppers 351 and 352 abut against the screws 342 and 343, respectively,as is apparent from FIGS. 6A and 6B. The screws 342 and 343 are turnedto adjust the azimuth of the record/play head 14 and the erase head 32in the conditions shown in FIGS. 6A and 6B, respectively. Therecord/play head 14 and the erase head 32 are electrically connected tocircuit sections of the recording and reproducing systems (not shown)via a connecting wire 39 extending through the head support 33, the headbase plate 35, the head mount assembly 34 and the center of the gear 36.

Arrows 40 are marked on the the periphery of the head support 33 toindicate the tape transport direction in their positions respectivelyshown in FIGS. 6A and 6B. A tape guide portion 331 is formed to supportboth sides of the tape 38 at one side of the head support 33. A torsionspring 41 shown in FIG. 6B stabilizes the head support 33 at the twopositions respectively shown in FIGS. 6A and 6B. The torsion spring 41will be described later in detail.

FIG. 7 shows a detailed condition of the head support 33 mounted on thehead base plate 35. Through holes 332 and 333 are formed at both ends ofthe central portion of the head support 33 in which the record/play head14 and the erase head 32 are mounted. The head base plate 35 isrotatably supported on the head mount assembly 34. A through hole 353through which the connecting wire 39 extends is formed at the center ofrotation of the head base plate 35. Screw holes 354 and 355 are formedat both sides of the through hole 353 and correspond to the throughholes 332 and 333 of the head support 33, respectively.

With the above arrangement, screws 42 are inserted from the tape contactsurface 142 of the record/play head 14 of the head support 33 into thescrew holes 354 and 355 of the head base plate 35 through the throughholes 332 and 333. The head support 33 is mounted on the head base plate35.

FIG. 8 is a detailed exploded perspective view of the head rotatingmechanism 102. The head support 33 has a substantially cylindrical shapeand a substantially concave-shaped notch 334 is formed from itsperiphery to substantially its center. The record/play head 14 is fittedat substantially the center of the notch 334 so as to slightly extendthe tape contact surface 142 therefrom. The erase head 32 is fitted atthe end portion of the notch 334 of the head support 33.

A through hole 345 is formed substantially at the center of the headmount assembly 34. A shaft 43 of substantially a cylindrical shape isloosely fitted in the through hole 345 of the head mount assembly 34.One end of the shaft 43 is fitted in the through hole 353 of the headbase plate 35. The other end of the shaft 43 is fitted in the throughhole 361 formed at the center of rotation of the gear 36. The head baseplate 35 and the gear 36 are integrally coaxially coupled through theshaft 43 and are rotatably supported by the shaft 43. The connectingwire 39 extends through the shaft 43 and is guided outside the headrotating mechanism 102.

The screws 342 and 343 are screwed and securely fixed in the screw holes346 and 347 of the head mount assembly 34 through plate washers 44 andcoil springs 45, respectively.

A through hole 373 is formed at a central portion 372 of the gear 37. Ascrew 375 is inserted through a spacer 374 of substantially acylindrical shape in the through hole 373. When the screw 375 is screwedat one side of the head mount assembly 34, as shown in FIG. 9A, the gear37 is pivotally supported on the head mount assembly 34. One end of thetorsion spring 41 is engaged with the engaging portion 362 extendingpart of the gear 36. The other end of the torsion spring 41 is engagedwith the through hole 376 formed in the vicinity of the central portion372 of the gear 37.

The mode of operation of the torsion spring 41 which stabilizes the twopositions of the head support 33 will be described. Assume that the gear37 is located in a position indicated in FIG. 9A. The biasing force ofthe torsion spring 41 acts on the gear 37 to pivot it in thecounterclockwise direction indicated by the arrow in FIG. 9B, while thebiasing force acts on the gear 36 to rotate it in the clockwisedirection. However, since the stopper 351 of the head base plate 35which is rotated together with the gear 36 abuts against the screw 342,the gear 36 is not rotated in the clockwise direction and stably kept atthe position shown in FIG. 6A.

In the stable condition shown in FIG. 9B, assume that the gear 37 ispivoted in the clockwise direction against the biasing force of thetorsion spring 41 by the driven portion 371 of the gear 37. Both ends ofthe torsion springs 41 come closer. Thereafter, when the gear 37 ispivoted to the position indicated in FIG. 9C, the torsion spring 41causes the gear 37 to pivot in the clockwise direction as indicated bythe arrow and to pivot the gear 36 in the counterclockwise direction.However, in practice, the stopper 352 of the head base plate 35 rotatingtogether with the gear 36 abuts against the screw 343, preventingrotation of the gear 36 in the counterclockwise direction. Thus, thehead support 33 is held at the position shown in FIG. 6B stably.

FIGS. 10A and 10B and FIGS. 11A and 11B respectively show the conditionsof the head rotating mechanism 102 at various angles.

In the tape recorder having an automatic reverse device with the headrotating mechanism 102 described above, the record/play head 14 and theerase head 32 are rotated to always face the tape 38, as shown in FIGS.6A and 6B. Therefore, a space for allowing movement of the head in theconventional device need not be arranged in the tape recordermechanisms, resulting in a compact tape recorder of light weight.Further, since the head mount assembly 34 includes the head support 33,the head base plate 35, the gear 36, the gear 37 and so on, the headrotating mechanism 102 is assembled in a single unit. Therefore, massproduction of the tape recorder of this type can be easily accomplished.Further, the head rotating mechanism 102 is assembled by mounting thehead mount assembly 34 to the head slider 13, resulting in easyassembly.

Before the head rotating mechanism 102 is mounted on the head slider 13,that is, when the head rotating mechanism 102 is just assembled, thescrews 342 and 343 need not be precisely screwed for azimuth adjustment.In other words, the screws 342 and 343 are simply screwed in the screwholes 346 and 347 since these screws only serve to contact with thestoppers 351 and 352 of the head base plate 35 so as not to rotate thegear 36 under the condition shown in FIG. 9B or 9C after assembly of thehead rotating mechanism 102. When the head rotating mechanism 102 isthen mounted on the head slider 13, the screws 342 and 343 are adjustedfor proper azimuth of the heads. Therefore, the head rotating mechanismis further easily manufactured.

The screws 42 for coupling the head support 33 and the head base plate35 are inserted from the side through which the record/play head 14 andthe erase head 32 are exposed. In other words, the screws 42 areinserted to extend through the head rotating mechanism 102. The screwheads may not extend from the side surface of the head support 33. Forthis reason, the arrows 40 can be marked on the periphery of the headsupport 33 to indicate the tape transport direction. The space formarking the arrows 40 is guaranteed on the periphery of the head support33 by inserting the screws 42 from the side from which the record/playhead 14 and the erase head 32 of the head support 33 extend.

The arrows 40 for indicating the tape transport direction arerespectively marked on the opposing peripheral portions of the headsupport 33 when the head support 33 is located in one of the twopositions shown in FIGS. 6A and 6B. However, a means for indicating thetape transport direction is not limited to the arrows. The opposingperipheral portions respectively corresponding to the forward andreverse tape transport directions may be colored in different colors.

For example, as shown in FIG. 12A, patterns may be changed incorrespondence with the normal speed forward (F) or reverse (R) mode.Similarly, various modifications may be provided, as shown in FIGS. 12Bto 12F.

In the above embodiment, the arrows 40 (indicators) are marked toindicate the tape transport directions, so that a special tape transportindicator is not required, resulting in simple indication by the tapetransport indicator. Since the record/play head 14 and the erase head 32are rotated to face the tape 38, simple indicators such as the arrows 40can be arranged.

Further, since the torsion spring 41 is used to retain the head support33 at positions shown in FIGS. 6A and 6B, simple arrangement and easyassembly are further achieved. The torsion spring 41 is hooked betweenthe gear 37 and the gear 36. Thus, the torsion spring 41 is one of thecomponents of the head rotating mechanism 102 and does not prevent toarrange the head rotating mechanism 102 in a unit.

The conventional head moving mechanism couples the head assembly to thechassis by a coil spring. Even if the head assembly is mounted on thechassis, the head moving mechanism is not operated properly. The springmust be hooked between the head mechanism and the chassis.

However, since the torsion spring 41 is used in the head rotatingmechanism 102 according to the present invention, as described above,the head rotating mechanism 102 as a single unit sufficiently rotatesthe record/play head 14 and the erase head 32 and keep them in thestable condition. Therefore, arrangement of the head rotating mechanism102 becomes simple and assembling operation is efficiently performed ascompared with the conventional assembling operation.

The record/play head 14 and the erase head 32 for the microcassette taperecorder are used. The head support 33 is kept in the position in one ofthe positions and its center of rotation is determined to insert therecord/play head 14 and the erase head 32 shown in FIGS. 6A and 6Bthrough the head insertion holes formed in the cassette half of thecompact tape cassette and to bring them in contact with the tape.

When the record/play head of the microcassette tape recorder is arrangedparallel to the erase head of the compact cassette tape recorder, theseheads can be sufficiently inserted in the head insertion hole of thecompact cassette half. The erase head 32 may be replaced with the erasehead for the compact cassette tape recorder. In this case, the center ofrotation of the head support 33 is determined so as to insert therecord/play head and the erase head through the head insertion hole inconsideration of both head rotating positions.

In the forward and reverse playback (recording) mode with the automaticreverse function, only one record/play head 14 and one erase head 32 areneeded, resulting in simple construction and economy. In the taperecorder having the conventional automatic reverse function, therecord/play head is movable and a pair of erase heads are disposed atpositions corresponding to a pair of erase head insertion holes,resulting in complex structure and economical disadvantages. When therecord/play head 14 and the erase head 32 can be inserted in the headinsertion hole of the compact cassette half, one record/play head 14 andone erase head 32 are required, resulting in structural convenience andeconomy. At the same time, the record/play head 14 and the erase head 32need not be electrically switched.

Further, since the record/play head 14 and the erase head 32 are mountedon the same head support 33, the swing angle, the relative gap betweenthe heads, and the position of the heads relative to the head supportcan be easily adjusted and heat dissipating effects are improved.

A combination head having the record head and the play head which arearranged parallel to each other as the record/play head 14 may be used.The record head RH, the play head PH and the erase head EH are mountedin the head support 33 shown in FIG. 6C. The head support 33 is arrangedto be rotated so that these heads are inserted in the head insertionhole of the compact cassette half.

FIG. 13 shows the positional relation of the record/play head 14 and thetape 38 in a cassette half 46 of the compact tape cassette. It is knownthat a pair of tape guide rollers 47 and a pair of tape guide pins 48are disposed in the cassette half 46. A tape pad 49 is supported by aleaf spring 50 substantially at the center of the cassette half 46.Capstan insertion holes 461 and 462 in which the capstans 17 and 18 areinserted are formed at predetermined positions of the cassette half 46,respectively. Further, guide pin insertion holes 463 and 464 into whichguide pins (not shown) projecting from the main chassis 11 extend, headinsertion hole 465, erase head insertion holes 466 and 467, and pinchroller insertion holes 468 and 469 into which the pinch rollers 15 and16 are respectively inserted are formed in the predetermined positionsin the cassette half 46.

As shown in FIG. 13, the record/play head 14 and the erase head 32 areinserted together into the head insertion hole 465 of the cassette half46 and come in contact with the tape 38. A pair of tape guides 51mounted at both sides of the head rotating mechanism 102 of the headslider 13 are fitted in the erase head insertion holes 466 and 467 ofthe cassette half 46.

Assume that the pinch roller 16 is in tight contact with the capstan 18through the tape 38 and the tape 38 is driven in the forward directionindicated by arrow K. A line ii perpendicular to the vertex of therecord/play head 14 is deviated by a predetermined distance α from thecentral line of the head insertion hole 465, that is, from theperpendicular bisector i connecting the axes of the capstans 17 and 18in the tape drive direction. The perpendicular bisector i corresponds tothe center of the tape pad 49 and the cassette half 46. The distance inpractice is about 0.5 mm.

When the line ii from the vertex of the record/play head 14 is deviatedby the distance α from the perpendicular bisector i, the followingeffects are obtained. The leaf spring 50 mounted on the tape pad 49 isloosely supported in the cassette half 46. The leaf spring 50 is looselysupported in the longitudinal direction of the tape 38. When the tape 38is driven in the direction indicated by arrow K, the leaf spring 50 isalso moved in the same direction due to friction between the tape pad 49and the tape 38 until the end of the leaf spring 50 abuts against thewall. The center of the tape pad 49 is slightly deviated to the rightfrom the perpendicular bisector i.

When the vertex of the record/play head 14 is deviated by the distancefrom the center of the pad 49 (cassette half 46), the central portion ofthe tape pad 49 comes in contact with the vertex of the record/play head14 when the tape 38 is driven in the direction indicated by arrow K.Thus, the tape 38 is stably and sufficiently in contact with therecord/play head 14 by the tape pad 49, resulting in excellent recordingand reproducing. When the tape 38 is driven in the reverse direction,the same effect is obtained. Assume that the pinch roller 15 comes intight contact with the capstan 17 through the tape 38, that the headsupport 33 orients in the direction opposite to the direction shown inFIG. 13 and that the tape 38 is driven in the direction indicated by thearrow L. The line i perpendicular to the vertex of the record/play head14 is deviated from the perpendicular bisector ii by the distance α inthe left direction. The tape pad 49 is also slightly moved in the samedirection upon travelling of the tape 38 in the direction indicated byarrow L. As a result, the same results as described above are obtained.

As shown in FIG. 14A, the vertex of the erase head 32 is disposed at aposition lower than that of the record/play head 14 by a distance β. Thedistance β is actually about 0.2 mm. With this difference, the followingeffects are obtained.

It is known that the tape 38 may be driven at a high speed in slightlycontact with the record/play head 14 to provide a means for detectingblank portions between songs and playing back from the beginning of adesired song for a special cuing operation. Since the height of theerase head 32 is lower than that of the record/play head 14, the tape 38comes in contact with only the top of the record/play head 14 as shownin FIG. 14B. The tape 38 is not in contact with the erase head portion,thus preventing an excessive load on the tape 38 and accomplishing cuingoperation effectively. The arrangement of the record/play head and theerase head is conveniently used in the normal cue and review modes.

Further, as shown in FIG. 14C, even when the normal playback andrecording are performed, the tape 38 comes in complete contact with therecord/play head 14 and the erase head 32, thus preventing degradationof recording and reproducing characteristics of the signals.

In order to attain sufficient contact of the tape 38 with therecord/play head 14 and the erase head 32, a means shown in FIG. 15 isused. As described above with reference to FIG. 13, substantiallycolumnar-shaped guide portions 52 are formed to guide the tape 38 to theboth ends of the head insertion hole 465. As shown in FIG. 15, duringthe recording and reproducing operations, the tape 38 located in theguide portions 52 is urged by the record/play head 14 and the erase head32 to have substantially an arcuated shape. Thus, recording andreproduction are performed. The tape contact surfaces of the record/playhead 14 and the erase head 32 extend upward in the figure from a lineiii connecting the centers of the both guide portions 52. The tapecontact surfaces of the record/play head 14 and the erase head 32 extendin the direction in which these heads 14 and 32 cause the tape 38 toabut against the guide portions 52.

The tape 38, therefore, extends upward in the figure from the line iiiin a substantially arcuated shape. The heights of the record/play head14 and the erase head 32 are determined so as to define the vertex ofthe arc of the tape 38. Simultaneously, a central line iv of thearcuated surface of the record/play head 14 which contacts with the tape38 and a central line v of the arcuated surface of the erase head 32which contacts with the tape 38 cross each other at the side opposite tothe side in which the tape extends in an arcuated shape, that is, at theside below the line iii.

The mounting conditions of the record/play head 14 and the erase head 32are set as described above. Thus, the tape 38 comes in contact with therecord/play head 14 and the erase head 32 properly in a very simplearrangement.

FIGS. 16 and 17 show modifications for mounting heads shown in FIG. 15.

The guide portions 52 may be the capstans 17 and 18.

What is claimed is:
 1. A tape recorder, comprising:a head chassis; ahead mount assembly, fixed to said head chassis, having a surfaceparallel with a plane in which a tape running on said tape recorderwould run, and provided with a through-hole about a central portionthereof, said through-hole extending in a direction perpendicular tosaid surface of said head mount assembly; a shaft rotatably insertedthrough the through-hole of the head mount assembly; head base platehaving one surface parallel with the surface of the head mount assemblyand the other surface providing a mounting surface, the central portionof the head base plate being fixed to the edge of the shaft such thatthe head base plate is rotatably together with the shaft in parallelwith the surface of the head mount assembly; a record/play head and anerase head each having a surface which abuts against the tape; a headsupport for supporting the record/play head and the erase head, therecord/play head being supported such that the tape-abutting surface ofthe record/play head is exposed to the outer surface of said headsupport, the erase head being supported at a position outside therecord/play head such that the tape-abutting surface of the erase headis exposed to the outer surface of said head support; and switchingmeans for selectively running the tape at a constant speed in theforward and reverse directions, the shaft rotatably inserted into thethrough-hole of the head mount assembly being interlocked with theswitching means to move the record/play head and erase head to thepositions where the tape running in the forward or reverse direction ata constant speed abuts against said heads.
 2. A tape recorder accordingto claim 1, wherein said head support of a substantially columnar shapehas a notch formed to extend from a peripheral portion to a centralportion thereof, said record/play head is fitted in a portion near thecentral portion of said notch and said erase head is fitted in a portionnear the peripheral portion thereof.
 3. A tape recorder according toclaim 1 further comprising a pair of stoppers for stopping a rotation ofthe head support.
 4. A tape recorder according to claim 1 wherein saidhead base plate has projecting portions defining holes which engagerecessed portions around through-holes of said head support so as tocontrol the relative positions of the head base plate and head support.5. A tape recorder according to claim 1 wherein said head support hasprojecting portions defining holes which engage recessed portions aroundthrough-holes of said head base plate so as to control the relativepositions of the head base plate and head support.
 6. A tape recorderaccording to claim 1 further comprising a fixing member inserted fromthe outer surface of said head support for fixing the head support tosaid head base plate.